Oral vs Intravesical Analgesia for Office Bladder Botox Injections

The primary aim of this randomized clinical trial is to compare the analgesic effect of oral phenazopyridine to that of intravesical lidocaine during intradetrusor injections of onabotulinumtoxinA performed for idiopathic overactive bladder. The investigators will achieve this by measuring the mean visual-analog pain scores (VAS) in women who are randomized to receive either oral phenazopyridine or intravesical lidocaine. Secondary aims include assessment of: 1. Overall Patient Satisfaction: To compare overall patient satisfaction with the onabotulinumtoxinA injection procedure in women randomized to pre-procedure oral phenazopyridine versus those randomized to intravesical lidocaine instillation. 2. Ease of Procedure: To compare the physician's perception of ease of onabotulinumtoxinA injection procedure in women randomized to pre-procedure oral phenazopyridine versus those randomized to intravesical lidocaine instillation. 3. Office Efficiency/Total Appointment Duration: To compare total appointment time or total time spent in an office exam/procedure room in women randomized to pre-procedure oral phenazopyridine versus those randomized to intravesical lidocaine instillation.